EP0467412A3 - Line equalizer for digital signals - Google Patents

Line equalizer for digital signals Download PDF

Info

Publication number
EP0467412A3
EP0467412A3 EP19910112239 EP91112239A EP0467412A3 EP 0467412 A3 EP0467412 A3 EP 0467412A3 EP 19910112239 EP19910112239 EP 19910112239 EP 91112239 A EP91112239 A EP 91112239A EP 0467412 A3 EP0467412 A3 EP 0467412A3
Authority
EP
European Patent Office
Prior art keywords
digital signals
line equalizer
equalizer
line
digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP19910112239
Other versions
EP0467412A2 (en
Inventor
Mitsuo Kakuishi
Yutaka Awata
Norio Ueno
Seiji Miyoshi
Norio Murakami
Atsushi Manabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2190683A external-priority patent/JPH0479509A/en
Priority claimed from JP19069090A external-priority patent/JPH0481015A/en
Priority claimed from JP2269355A external-priority patent/JP3066652B2/en
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP0467412A2 publication Critical patent/EP0467412A2/en
Publication of EP0467412A3 publication Critical patent/EP0467412A3/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03878—Line equalisers; line build-out devices
    • H04L25/03885—Line equalisers; line build-out devices adaptive
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
EP19910112239 1990-07-20 1991-07-22 Line equalizer for digital signals Ceased EP0467412A3 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP190683/90 1990-07-20
JP2190683A JPH0479509A (en) 1990-07-20 1990-07-20 Timing adjustment device
JP19069090A JPH0481015A (en) 1990-07-20 1990-07-20 Digital variable equalizer
JP190690/90 1990-07-20
JP269355/90 1990-10-09
JP2269355A JP3066652B2 (en) 1990-10-09 1990-10-09 Line equalizer

Publications (2)

Publication Number Publication Date
EP0467412A2 EP0467412A2 (en) 1992-01-22
EP0467412A3 true EP0467412A3 (en) 1993-04-28

Family

ID=27326363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910112239 Ceased EP0467412A3 (en) 1990-07-20 1991-07-22 Line equalizer for digital signals

Country Status (3)

Country Link
US (1) US5481564A (en)
EP (1) EP0467412A3 (en)
CA (1) CA2047557C (en)

Families Citing this family (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2688367A1 (en) * 1993-03-01 1993-09-10 Alcatel Nv Automatic gain control in a radio frequency receiver including a time-based equaliser circuit
US5448590A (en) * 1993-03-23 1995-09-05 At&T Corp. Equalization technique for compensating for degradation to the transmission of digitally modulated signals
JPH07123027A (en) * 1993-10-26 1995-05-12 Fujitsu Ltd Digital subscriber line transmitter
JPH0879135A (en) * 1994-09-06 1996-03-22 Matsushita Electric Ind Co Ltd Digital signal error reduction device
DE4434723C1 (en) * 1994-09-28 1995-06-14 Siemens Ag Adaptive network for digital transmission system
JP3530596B2 (en) * 1994-10-04 2004-05-24 キヤノン株式会社 Playback device
ES2101639B1 (en) * 1994-10-21 1998-03-01 Alcatel Standard Electrica ADAPTIVE EQUALIZER.
US6057875A (en) * 1995-12-27 2000-05-02 Sony Corporation Remotely controlled cable equalization for in-flight entertainment systems
JPH09245435A (en) * 1996-03-05 1997-09-19 Sony Corp Data reproducing equipment
US5809072A (en) * 1996-03-15 1998-09-15 Integrated Circuit Systems Mixed signal adaptive equalizer
JPH09326729A (en) * 1996-06-03 1997-12-16 Fujitsu Ltd Subscriber line termination circuit
US6044110A (en) * 1996-08-15 2000-03-28 Lsi Logic Corporation Method and apparatus for transmission line equalization
JPH10135875A (en) * 1996-10-28 1998-05-22 Nec Corp Echo canceller
US5742642A (en) * 1996-10-29 1998-04-21 Telefonaktiebolaget Lm Ericsson Signal processing method and apparatus for reducing equalizer error
US6118812A (en) * 1997-05-20 2000-09-12 Lucent Technologies Inc. Digital equalization in the presence of quantization noise
US5880645A (en) * 1997-07-03 1999-03-09 Level One Communications, Inc. Analog adaptive equalizer with gain and filter correction
DE19735752A1 (en) * 1997-08-18 1999-02-25 Siemens Ag Noise suppression method in bipolar data flow
JPH1188118A (en) * 1997-09-03 1999-03-30 Matsushita Electric Ind Co Ltd Matched filter and timing detection method
US6144697A (en) * 1998-02-02 2000-11-07 Purdue Research Foundation Equalization techniques to reduce intersymbol interference
US6115418A (en) 1998-02-09 2000-09-05 National Semiconductor Corporation Simplified equalizer for twisted pair channel
US6169764B1 (en) * 1998-03-19 2001-01-02 Plato Labs, Inc. Analog adaptive line equalizer
US6415003B1 (en) 1998-09-11 2002-07-02 National Semiconductor Corporation Digital baseline wander correction circuit
US6438163B1 (en) * 1998-09-25 2002-08-20 National Semiconductor Corporation Cable length and quality indicator
US6546047B1 (en) * 1998-10-08 2003-04-08 Altima Communications, Inc. Methods and circuits for optimal equalization
US6542540B1 (en) 1998-12-21 2003-04-01 Analog Devices, Inc. Integrated analog adaptive equalizer
US6438156B1 (en) * 1999-02-11 2002-08-20 Adtran, Inc. Stepwise adaptive finite impulse response filter for spread spectrum radio
US6418172B1 (en) 1999-04-21 2002-07-09 National Semiconductor Corporation Look-ahead maximum likelihood sequence estimation decoder
JP2000324024A (en) * 1999-05-10 2000-11-24 Mitsubishi Electric Corp Adaptive equalizer and its designing method
JP2001069046A (en) * 1999-08-30 2001-03-16 Fujitsu Ltd Transmission reception system and receiver
KR100724346B1 (en) * 1999-09-01 2007-06-04 엘지전자 주식회사 Self calibrating demodulator system and method therefor
US6295015B1 (en) * 1999-09-01 2001-09-25 Zenith Electronics Corporation Reference generator for demodulator calibration
US6166594A (en) * 1999-09-01 2000-12-26 Zenith Electronics Corporation Self calibrating demodulator system
US6678319B1 (en) * 2000-01-11 2004-01-13 Canon Kabushiki Kaisha Digital signal processing for high-speed communications
US6873663B1 (en) * 2000-02-16 2005-03-29 Telefonaktiebolaget Lm Ericsson Reception of M-ary PSK-modulated signals
US7254198B1 (en) 2000-04-28 2007-08-07 National Semiconductor Corporation Receiver system having analog pre-filter and digital equalizer
US7050517B1 (en) 2000-04-28 2006-05-23 National Semiconductor Corporation System and method suitable for receiving gigabit ethernet signals
JP3434786B2 (en) * 2000-06-30 2003-08-11 松下電器産業株式会社 Amplitude detection circuit
DE10042930B4 (en) * 2000-08-31 2005-07-14 Infineon Technologies Ag Digital filter
DE10060425A1 (en) * 2000-12-05 2002-06-13 Infineon Technologies Ag receiver circuit
US20020168001A1 (en) * 2001-05-09 2002-11-14 Jeffrey Ramsey Systems and method for determining the phase angle response in a CATV system
DE10124177A1 (en) 2001-05-17 2002-11-28 Infineon Technologies Ag Reconstruction of pulsed symbolic analog data subject to transmission link interference, employs filtration, ADC and digital cable approximation
IES20020643A2 (en) * 2001-08-02 2003-03-19 Massana Res Ltd Channel equalisation in data receivers
US7424053B2 (en) * 2001-08-02 2008-09-09 Agere Systems Inc. Channel equalization in data receivers
US20030104783A1 (en) * 2001-12-04 2003-06-05 Esion-Tech, Llc Adaptive electromagnetic interference rejection system and method
EP1255386B1 (en) 2001-12-05 2007-10-24 Agilent Technologies, Inc. Line equaliser for compensation of droop effect
US7068711B2 (en) * 2002-03-13 2006-06-27 Agere Systems Inc. Multi-function equalizer arrangement
US7239680B2 (en) * 2002-07-17 2007-07-03 Broadcom Corporation Methods for performing channel diagnostics
US7480326B2 (en) * 2002-07-17 2009-01-20 Broadcom Corporation Channel diagnostic systems and methods
US7286620B2 (en) * 2003-09-17 2007-10-23 International Business Machines Corporation Equalizer for reduced intersymbol interference via partial clock switching
US20050201454A1 (en) * 2004-03-12 2005-09-15 Intel Corporation System and method for automatically calibrating two-tap and multi-tap equalization for a communications link
US20070058705A1 (en) * 2005-09-13 2007-03-15 Sbc Knowledge Ventures, L.P. System and method to transmit a data stream
US8331430B2 (en) * 2006-08-02 2012-12-11 Broadcom Corporation Channel diagnostic systems and methods
KR100764777B1 (en) 2006-12-20 2007-10-12 엘지전자 주식회사 Reference signal generator for self calibrating demodulator system and method therefor
EP2498463A3 (en) 2007-01-08 2013-09-11 Rambus Inc. Adaptive continuous-time line equalizer for correcting the first post-cursor ISI
WO2009076355A1 (en) * 2007-12-11 2009-06-18 Marvell World Trade Ltd. Sub-symbol rate cable tester
US8743940B1 (en) * 2010-01-07 2014-06-03 Marvell International Ltd. Method and apparatus for adaptively determining settings of a transmit equalizer
US8811464B1 (en) 2010-01-21 2014-08-19 Marvell International Ltd. Method and apparatus for adaptively determining equalizer settings for 10GBASE-KR transmitter
WO2012073405A1 (en) * 2010-11-30 2012-06-07 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 Wireless transceiver and method for controlling same
CN103684601B (en) * 2012-09-14 2016-04-20 富士通株式会社 Coefficient determining device, equalizer, Receiver And Transmitter
KR102430572B1 (en) * 2018-06-18 2022-08-09 삼성전자주식회사 Electronic device including equalizer operating based on coefficient adjusted in training operation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
EP0054609A2 (en) * 1980-12-17 1982-06-30 ANT Nachrichtentechnik GmbH Arrangement for adjusting the echo cancellation coefficients at combined adaptive echo cancellation and equalization
EP0137213A2 (en) * 1983-08-11 1985-04-17 SIP Società Italiana per l'Esercizio Telefonico p.a. Adaptive equalizer for digital signals affected by distorsions with time varying characteristics

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659229A (en) * 1970-11-02 1972-04-25 Gen Electric System and method for automatic adaptive equalization of communication channels
NL171215C (en) * 1973-03-09 1983-02-16 Trt Telecom Radio Electr AUTOMATIC EQUALIZATION DEVICE FOR A DATA TRANSMISSION CHANNEL.
WO1981001089A1 (en) * 1979-10-15 1981-04-16 Western Electric Co Control of coefficient drift for fractionally spaced equalizers
JPS5892119A (en) * 1981-11-27 1983-06-01 Hitachi Ltd Line equalizer
JPS59211313A (en) * 1983-05-17 1984-11-30 Toshiba Corp Automatic equalizer
JPS60201716A (en) * 1984-03-26 1985-10-12 Nec Corp Transversal equalizer
US4707841A (en) * 1984-08-21 1987-11-17 University Of Toronto, Innovations Foundation Digital data receiver for preamble free data transmission
JPS6182545A (en) * 1984-08-29 1986-04-26 Fujitsu Ltd Timing leading-in method
JPH0746788B2 (en) * 1985-11-05 1995-05-17 日本電気株式会社 Automatic track equalizer
JPS62231526A (en) * 1986-03-31 1987-10-12 Nec Corp Agc control system
JP2592449B2 (en) * 1987-02-27 1997-03-19 株式会社日立製作所 Waveform equalizer
US4789994A (en) * 1987-08-12 1988-12-06 American Telephone And Telegraph Company, At&T Bell Laboratories Adaptive equalizer using precursor error signal for convergence control
GB8721159D0 (en) * 1987-09-09 1987-10-14 Philips Nv Adjusting filter coefficients
JPH0750863B2 (en) * 1987-09-25 1995-05-31 日本電気株式会社 Receiver
US4833788A (en) * 1987-11-09 1989-05-30 Munro John C Univeral level light adapter
US5142552A (en) * 1988-02-22 1992-08-25 Silicon Systems, Inc. Method and apparatus for analog D.C. offset cancellation
JPH0231524A (en) * 1988-07-20 1990-02-01 Mitsubishi Electric Corp Adaptive equalizer
US5119401A (en) * 1989-11-17 1992-06-02 Nec Corporation Decision feedback equalizer including forward part whose signal reference point is shiftable depending on channel response

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
EP0054609A2 (en) * 1980-12-17 1982-06-30 ANT Nachrichtentechnik GmbH Arrangement for adjusting the echo cancellation coefficients at combined adaptive echo cancellation and equalization
EP0137213A2 (en) * 1983-08-11 1985-04-17 SIP Società Italiana per l'Esercizio Telefonico p.a. Adaptive equalizer for digital signals affected by distorsions with time varying characteristics

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE GLOBECOM '84, 26.-29.11.1984, Atlanta, US, vol. 1, pages 26-31, IEEE, New York, US; H. TAKATORI et al.: 'Low-Power Line Equalizer for Digital Subscriber Loop.' *
IEEE JOURNAL OF SOLID-STATE CIRCUITS vol. 23, no. 1, February 1988, NEW YORK US pages 118 - 123 H. ANDO ET AL.: 'A DSP Line Equalizer VLSI for TCM Digital Subscriber-Line Transmission.' *
IEEE JOURNAL OF SOLID-STATE CIRCUITS vol. 23, no. 3, June 1988, NEW YORK US pages 657 - 663 D. INAMI ET AL.: 'An Adaptive Line Equalizer LSI for ISDN Subscriber Loops.' *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 101 (E-595) & JP-A-62 231 526 ( NEC CORPORATION ) *
PATENT ABSTRACTS OF JAPAN, vol. 14, no. 178 (E-915), 10th April 1990; & JP-A-2 031 524 (MITSUBISHI ELECTRIC CORP.) 01-02-1990 *
SIGNAL PROCESSING, vol. 20, no. 1, May 1990, pages 43-65, Amsterdam, NL; S. MARCOS et al.: "Joint adaptive echo cancellation and channel equalization for data transmission" *
THE BELL SYSTEM TECHNICAL JOURNAL, vol. 58, no. 2, February 1979, pages 491-500; K.H. MUELLER: "Combining echo cancellation and decision feedback equalization" *

Also Published As

Publication number Publication date
EP0467412A2 (en) 1992-01-22
CA2047557A1 (en) 1992-01-21
US5481564A (en) 1996-01-02
CA2047557C (en) 1996-12-10

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